4 * Copyright IBM, Corp. 2008
8 * Anthony Liguori <aliguori@us.ibm.com>
9 * Glauber Costa <gcosta@redhat.com>
11 * This work is licensed under the terms of the GNU GPL, version 2 or later.
12 * See the COPYING file in the top-level directory.
16 #include <sys/types.h>
17 #include <sys/ioctl.h>
21 #include <linux/kvm.h>
23 #include "qemu-common.h"
24 #include "qemu-barrier.h"
31 #include "exec-memory.h"
33 /* This check must be after config-host.h is included */
35 #include <sys/eventfd.h>
38 /* KVM uses PAGE_SIZE in it's definition of COALESCED_MMIO_MAX */
39 #define PAGE_SIZE TARGET_PAGE_SIZE
44 #define DPRINTF(fmt, ...) \
45 do { fprintf(stderr, fmt, ## __VA_ARGS__); } while (0)
47 #define DPRINTF(fmt, ...) \
51 typedef struct KVMSlot
53 target_phys_addr_t start_addr
;
54 ram_addr_t memory_size
;
60 typedef struct kvm_dirty_log KVMDirtyLog
;
68 struct kvm_coalesced_mmio_ring
*coalesced_mmio_ring
;
69 bool coalesced_flush_in_progress
;
70 int broken_set_mem_region
;
73 int robust_singlestep
;
75 #ifdef KVM_CAP_SET_GUEST_DEBUG
76 struct kvm_sw_breakpoint_head kvm_sw_breakpoints
;
82 int irqchip_inject_ioctl
;
83 #ifdef KVM_CAP_IRQ_ROUTING
84 struct kvm_irq_routing
*irq_routes
;
85 int nr_allocated_irq_routes
;
86 uint32_t *used_gsi_bitmap
;
92 bool kvm_kernel_irqchip
;
94 static const KVMCapabilityInfo kvm_required_capabilites
[] = {
95 KVM_CAP_INFO(USER_MEMORY
),
96 KVM_CAP_INFO(DESTROY_MEMORY_REGION_WORKS
),
100 static KVMSlot
*kvm_alloc_slot(KVMState
*s
)
104 for (i
= 0; i
< ARRAY_SIZE(s
->slots
); i
++) {
105 if (s
->slots
[i
].memory_size
== 0) {
110 fprintf(stderr
, "%s: no free slot available\n", __func__
);
114 static KVMSlot
*kvm_lookup_matching_slot(KVMState
*s
,
115 target_phys_addr_t start_addr
,
116 target_phys_addr_t end_addr
)
120 for (i
= 0; i
< ARRAY_SIZE(s
->slots
); i
++) {
121 KVMSlot
*mem
= &s
->slots
[i
];
123 if (start_addr
== mem
->start_addr
&&
124 end_addr
== mem
->start_addr
+ mem
->memory_size
) {
133 * Find overlapping slot with lowest start address
135 static KVMSlot
*kvm_lookup_overlapping_slot(KVMState
*s
,
136 target_phys_addr_t start_addr
,
137 target_phys_addr_t end_addr
)
139 KVMSlot
*found
= NULL
;
142 for (i
= 0; i
< ARRAY_SIZE(s
->slots
); i
++) {
143 KVMSlot
*mem
= &s
->slots
[i
];
145 if (mem
->memory_size
== 0 ||
146 (found
&& found
->start_addr
< mem
->start_addr
)) {
150 if (end_addr
> mem
->start_addr
&&
151 start_addr
< mem
->start_addr
+ mem
->memory_size
) {
159 int kvm_physical_memory_addr_from_host(KVMState
*s
, void *ram
,
160 target_phys_addr_t
*phys_addr
)
164 for (i
= 0; i
< ARRAY_SIZE(s
->slots
); i
++) {
165 KVMSlot
*mem
= &s
->slots
[i
];
167 if (ram
>= mem
->ram
&& ram
< mem
->ram
+ mem
->memory_size
) {
168 *phys_addr
= mem
->start_addr
+ (ram
- mem
->ram
);
176 static int kvm_set_user_memory_region(KVMState
*s
, KVMSlot
*slot
)
178 struct kvm_userspace_memory_region mem
;
180 mem
.slot
= slot
->slot
;
181 mem
.guest_phys_addr
= slot
->start_addr
;
182 mem
.memory_size
= slot
->memory_size
;
183 mem
.userspace_addr
= (unsigned long)slot
->ram
;
184 mem
.flags
= slot
->flags
;
185 if (s
->migration_log
) {
186 mem
.flags
|= KVM_MEM_LOG_DIRTY_PAGES
;
188 return kvm_vm_ioctl(s
, KVM_SET_USER_MEMORY_REGION
, &mem
);
191 static void kvm_reset_vcpu(void *opaque
)
193 CPUState
*env
= opaque
;
195 kvm_arch_reset_vcpu(env
);
198 int kvm_pit_in_kernel(void)
200 return kvm_state
->pit_in_kernel
;
203 int kvm_init_vcpu(CPUState
*env
)
205 KVMState
*s
= kvm_state
;
209 DPRINTF("kvm_init_vcpu\n");
211 ret
= kvm_vm_ioctl(s
, KVM_CREATE_VCPU
, env
->cpu_index
);
213 DPRINTF("kvm_create_vcpu failed\n");
219 env
->kvm_vcpu_dirty
= 1;
221 mmap_size
= kvm_ioctl(s
, KVM_GET_VCPU_MMAP_SIZE
, 0);
224 DPRINTF("KVM_GET_VCPU_MMAP_SIZE failed\n");
228 env
->kvm_run
= mmap(NULL
, mmap_size
, PROT_READ
| PROT_WRITE
, MAP_SHARED
,
230 if (env
->kvm_run
== MAP_FAILED
) {
232 DPRINTF("mmap'ing vcpu state failed\n");
236 if (s
->coalesced_mmio
&& !s
->coalesced_mmio_ring
) {
237 s
->coalesced_mmio_ring
=
238 (void *)env
->kvm_run
+ s
->coalesced_mmio
* PAGE_SIZE
;
241 ret
= kvm_arch_init_vcpu(env
);
243 qemu_register_reset(kvm_reset_vcpu
, env
);
244 kvm_arch_reset_vcpu(env
);
251 * dirty pages logging control
254 static int kvm_mem_flags(KVMState
*s
, bool log_dirty
)
256 return log_dirty
? KVM_MEM_LOG_DIRTY_PAGES
: 0;
259 static int kvm_slot_dirty_pages_log_change(KVMSlot
*mem
, bool log_dirty
)
261 KVMState
*s
= kvm_state
;
262 int flags
, mask
= KVM_MEM_LOG_DIRTY_PAGES
;
265 old_flags
= mem
->flags
;
267 flags
= (mem
->flags
& ~mask
) | kvm_mem_flags(s
, log_dirty
);
270 /* If nothing changed effectively, no need to issue ioctl */
271 if (s
->migration_log
) {
272 flags
|= KVM_MEM_LOG_DIRTY_PAGES
;
275 if (flags
== old_flags
) {
279 return kvm_set_user_memory_region(s
, mem
);
282 static int kvm_dirty_pages_log_change(target_phys_addr_t phys_addr
,
283 ram_addr_t size
, bool log_dirty
)
285 KVMState
*s
= kvm_state
;
286 KVMSlot
*mem
= kvm_lookup_matching_slot(s
, phys_addr
, phys_addr
+ size
);
289 fprintf(stderr
, "BUG: %s: invalid parameters " TARGET_FMT_plx
"-"
290 TARGET_FMT_plx
"\n", __func__
, phys_addr
,
291 (target_phys_addr_t
)(phys_addr
+ size
- 1));
294 return kvm_slot_dirty_pages_log_change(mem
, log_dirty
);
297 static void kvm_log_start(MemoryListener
*listener
,
298 MemoryRegionSection
*section
)
302 r
= kvm_dirty_pages_log_change(section
->offset_within_address_space
,
303 section
->size
, true);
309 static void kvm_log_stop(MemoryListener
*listener
,
310 MemoryRegionSection
*section
)
314 r
= kvm_dirty_pages_log_change(section
->offset_within_address_space
,
315 section
->size
, false);
321 static int kvm_set_migration_log(int enable
)
323 KVMState
*s
= kvm_state
;
327 s
->migration_log
= enable
;
329 for (i
= 0; i
< ARRAY_SIZE(s
->slots
); i
++) {
332 if (!mem
->memory_size
) {
335 if (!!(mem
->flags
& KVM_MEM_LOG_DIRTY_PAGES
) == enable
) {
338 err
= kvm_set_user_memory_region(s
, mem
);
346 /* get kvm's dirty pages bitmap and update qemu's */
347 static int kvm_get_dirty_pages_log_range(MemoryRegionSection
*section
,
348 unsigned long *bitmap
)
351 unsigned long page_number
, c
;
352 target_phys_addr_t addr
, addr1
;
353 unsigned int len
= ((section
->size
/ TARGET_PAGE_SIZE
) + HOST_LONG_BITS
- 1) / HOST_LONG_BITS
;
356 * bitmap-traveling is faster than memory-traveling (for addr...)
357 * especially when most of the memory is not dirty.
359 for (i
= 0; i
< len
; i
++) {
360 if (bitmap
[i
] != 0) {
361 c
= leul_to_cpu(bitmap
[i
]);
365 page_number
= i
* HOST_LONG_BITS
+ j
;
366 addr1
= page_number
* TARGET_PAGE_SIZE
;
367 addr
= section
->offset_within_region
+ addr1
;
368 memory_region_set_dirty(section
->mr
, addr
, TARGET_PAGE_SIZE
);
375 #define ALIGN(x, y) (((x)+(y)-1) & ~((y)-1))
378 * kvm_physical_sync_dirty_bitmap - Grab dirty bitmap from kernel space
379 * This function updates qemu's dirty bitmap using
380 * memory_region_set_dirty(). This means all bits are set
383 * @start_add: start of logged region.
384 * @end_addr: end of logged region.
386 static int kvm_physical_sync_dirty_bitmap(MemoryRegionSection
*section
)
388 KVMState
*s
= kvm_state
;
389 unsigned long size
, allocated_size
= 0;
393 target_phys_addr_t start_addr
= section
->offset_within_address_space
;
394 target_phys_addr_t end_addr
= start_addr
+ section
->size
;
396 d
.dirty_bitmap
= NULL
;
397 while (start_addr
< end_addr
) {
398 mem
= kvm_lookup_overlapping_slot(s
, start_addr
, end_addr
);
403 /* XXX bad kernel interface alert
404 * For dirty bitmap, kernel allocates array of size aligned to
405 * bits-per-long. But for case when the kernel is 64bits and
406 * the userspace is 32bits, userspace can't align to the same
407 * bits-per-long, since sizeof(long) is different between kernel
408 * and user space. This way, userspace will provide buffer which
409 * may be 4 bytes less than the kernel will use, resulting in
410 * userspace memory corruption (which is not detectable by valgrind
411 * too, in most cases).
412 * So for now, let's align to 64 instead of HOST_LONG_BITS here, in
413 * a hope that sizeof(long) wont become >8 any time soon.
415 size
= ALIGN(((mem
->memory_size
) >> TARGET_PAGE_BITS
),
416 /*HOST_LONG_BITS*/ 64) / 8;
417 if (!d
.dirty_bitmap
) {
418 d
.dirty_bitmap
= g_malloc(size
);
419 } else if (size
> allocated_size
) {
420 d
.dirty_bitmap
= g_realloc(d
.dirty_bitmap
, size
);
422 allocated_size
= size
;
423 memset(d
.dirty_bitmap
, 0, allocated_size
);
427 if (kvm_vm_ioctl(s
, KVM_GET_DIRTY_LOG
, &d
) == -1) {
428 DPRINTF("ioctl failed %d\n", errno
);
433 kvm_get_dirty_pages_log_range(section
, d
.dirty_bitmap
);
434 start_addr
= mem
->start_addr
+ mem
->memory_size
;
436 g_free(d
.dirty_bitmap
);
441 int kvm_coalesce_mmio_region(target_phys_addr_t start
, ram_addr_t size
)
444 KVMState
*s
= kvm_state
;
446 if (s
->coalesced_mmio
) {
447 struct kvm_coalesced_mmio_zone zone
;
452 ret
= kvm_vm_ioctl(s
, KVM_REGISTER_COALESCED_MMIO
, &zone
);
458 int kvm_uncoalesce_mmio_region(target_phys_addr_t start
, ram_addr_t size
)
461 KVMState
*s
= kvm_state
;
463 if (s
->coalesced_mmio
) {
464 struct kvm_coalesced_mmio_zone zone
;
469 ret
= kvm_vm_ioctl(s
, KVM_UNREGISTER_COALESCED_MMIO
, &zone
);
475 int kvm_check_extension(KVMState
*s
, unsigned int extension
)
479 ret
= kvm_ioctl(s
, KVM_CHECK_EXTENSION
, extension
);
487 static int kvm_check_many_ioeventfds(void)
489 /* Userspace can use ioeventfd for io notification. This requires a host
490 * that supports eventfd(2) and an I/O thread; since eventfd does not
491 * support SIGIO it cannot interrupt the vcpu.
493 * Older kernels have a 6 device limit on the KVM io bus. Find out so we
494 * can avoid creating too many ioeventfds.
496 #if defined(CONFIG_EVENTFD)
499 for (i
= 0; i
< ARRAY_SIZE(ioeventfds
); i
++) {
500 ioeventfds
[i
] = eventfd(0, EFD_CLOEXEC
);
501 if (ioeventfds
[i
] < 0) {
504 ret
= kvm_set_ioeventfd_pio_word(ioeventfds
[i
], 0, i
, true);
506 close(ioeventfds
[i
]);
511 /* Decide whether many devices are supported or not */
512 ret
= i
== ARRAY_SIZE(ioeventfds
);
515 kvm_set_ioeventfd_pio_word(ioeventfds
[i
], 0, i
, false);
516 close(ioeventfds
[i
]);
524 static const KVMCapabilityInfo
*
525 kvm_check_extension_list(KVMState
*s
, const KVMCapabilityInfo
*list
)
528 if (!kvm_check_extension(s
, list
->value
)) {
536 static void kvm_set_phys_mem(MemoryRegionSection
*section
, bool add
)
538 KVMState
*s
= kvm_state
;
541 MemoryRegion
*mr
= section
->mr
;
542 bool log_dirty
= memory_region_is_logging(mr
);
543 target_phys_addr_t start_addr
= section
->offset_within_address_space
;
544 ram_addr_t size
= section
->size
;
548 /* kvm works in page size chunks, but the function may be called
549 with sub-page size and unaligned start address. */
550 delta
= TARGET_PAGE_ALIGN(size
) - size
;
556 size
&= TARGET_PAGE_MASK
;
557 if (!size
|| (start_addr
& ~TARGET_PAGE_MASK
)) {
561 if (!memory_region_is_ram(mr
)) {
565 ram
= memory_region_get_ram_ptr(mr
) + section
->offset_within_region
+ delta
;
568 mem
= kvm_lookup_overlapping_slot(s
, start_addr
, start_addr
+ size
);
573 if (add
&& start_addr
>= mem
->start_addr
&&
574 (start_addr
+ size
<= mem
->start_addr
+ mem
->memory_size
) &&
575 (ram
- start_addr
== mem
->ram
- mem
->start_addr
)) {
576 /* The new slot fits into the existing one and comes with
577 * identical parameters - update flags and done. */
578 kvm_slot_dirty_pages_log_change(mem
, log_dirty
);
584 if (mem
->flags
& KVM_MEM_LOG_DIRTY_PAGES
) {
585 kvm_physical_sync_dirty_bitmap(section
);
588 /* unregister the overlapping slot */
589 mem
->memory_size
= 0;
590 err
= kvm_set_user_memory_region(s
, mem
);
592 fprintf(stderr
, "%s: error unregistering overlapping slot: %s\n",
593 __func__
, strerror(-err
));
597 /* Workaround for older KVM versions: we can't join slots, even not by
598 * unregistering the previous ones and then registering the larger
599 * slot. We have to maintain the existing fragmentation. Sigh.
601 * This workaround assumes that the new slot starts at the same
602 * address as the first existing one. If not or if some overlapping
603 * slot comes around later, we will fail (not seen in practice so far)
604 * - and actually require a recent KVM version. */
605 if (s
->broken_set_mem_region
&&
606 old
.start_addr
== start_addr
&& old
.memory_size
< size
&& add
) {
607 mem
= kvm_alloc_slot(s
);
608 mem
->memory_size
= old
.memory_size
;
609 mem
->start_addr
= old
.start_addr
;
611 mem
->flags
= kvm_mem_flags(s
, log_dirty
);
613 err
= kvm_set_user_memory_region(s
, mem
);
615 fprintf(stderr
, "%s: error updating slot: %s\n", __func__
,
620 start_addr
+= old
.memory_size
;
621 ram
+= old
.memory_size
;
622 size
-= old
.memory_size
;
626 /* register prefix slot */
627 if (old
.start_addr
< start_addr
) {
628 mem
= kvm_alloc_slot(s
);
629 mem
->memory_size
= start_addr
- old
.start_addr
;
630 mem
->start_addr
= old
.start_addr
;
632 mem
->flags
= kvm_mem_flags(s
, log_dirty
);
634 err
= kvm_set_user_memory_region(s
, mem
);
636 fprintf(stderr
, "%s: error registering prefix slot: %s\n",
637 __func__
, strerror(-err
));
639 fprintf(stderr
, "%s: This is probably because your kernel's " \
640 "PAGE_SIZE is too big. Please try to use 4k " \
641 "PAGE_SIZE!\n", __func__
);
647 /* register suffix slot */
648 if (old
.start_addr
+ old
.memory_size
> start_addr
+ size
) {
649 ram_addr_t size_delta
;
651 mem
= kvm_alloc_slot(s
);
652 mem
->start_addr
= start_addr
+ size
;
653 size_delta
= mem
->start_addr
- old
.start_addr
;
654 mem
->memory_size
= old
.memory_size
- size_delta
;
655 mem
->ram
= old
.ram
+ size_delta
;
656 mem
->flags
= kvm_mem_flags(s
, log_dirty
);
658 err
= kvm_set_user_memory_region(s
, mem
);
660 fprintf(stderr
, "%s: error registering suffix slot: %s\n",
661 __func__
, strerror(-err
));
667 /* in case the KVM bug workaround already "consumed" the new slot */
674 mem
= kvm_alloc_slot(s
);
675 mem
->memory_size
= size
;
676 mem
->start_addr
= start_addr
;
678 mem
->flags
= kvm_mem_flags(s
, log_dirty
);
680 err
= kvm_set_user_memory_region(s
, mem
);
682 fprintf(stderr
, "%s: error registering slot: %s\n", __func__
,
688 static void kvm_begin(MemoryListener
*listener
)
692 static void kvm_commit(MemoryListener
*listener
)
696 static void kvm_region_add(MemoryListener
*listener
,
697 MemoryRegionSection
*section
)
699 kvm_set_phys_mem(section
, true);
702 static void kvm_region_del(MemoryListener
*listener
,
703 MemoryRegionSection
*section
)
705 kvm_set_phys_mem(section
, false);
708 static void kvm_region_nop(MemoryListener
*listener
,
709 MemoryRegionSection
*section
)
713 static void kvm_log_sync(MemoryListener
*listener
,
714 MemoryRegionSection
*section
)
718 r
= kvm_physical_sync_dirty_bitmap(section
);
724 static void kvm_log_global_start(struct MemoryListener
*listener
)
728 r
= kvm_set_migration_log(1);
732 static void kvm_log_global_stop(struct MemoryListener
*listener
)
736 r
= kvm_set_migration_log(0);
740 static void kvm_mem_ioeventfd_add(MemoryRegionSection
*section
,
741 bool match_data
, uint64_t data
, int fd
)
745 assert(match_data
&& section
->size
== 4);
747 r
= kvm_set_ioeventfd_mmio_long(fd
, section
->offset_within_address_space
,
754 static void kvm_mem_ioeventfd_del(MemoryRegionSection
*section
,
755 bool match_data
, uint64_t data
, int fd
)
759 r
= kvm_set_ioeventfd_mmio_long(fd
, section
->offset_within_address_space
,
766 static void kvm_io_ioeventfd_add(MemoryRegionSection
*section
,
767 bool match_data
, uint64_t data
, int fd
)
771 assert(match_data
&& section
->size
== 2);
773 r
= kvm_set_ioeventfd_pio_word(fd
, section
->offset_within_address_space
,
780 static void kvm_io_ioeventfd_del(MemoryRegionSection
*section
,
781 bool match_data
, uint64_t data
, int fd
)
786 r
= kvm_set_ioeventfd_pio_word(fd
, section
->offset_within_address_space
,
793 static void kvm_eventfd_add(MemoryListener
*listener
,
794 MemoryRegionSection
*section
,
795 bool match_data
, uint64_t data
, int fd
)
797 if (section
->address_space
== get_system_memory()) {
798 kvm_mem_ioeventfd_add(section
, match_data
, data
, fd
);
800 kvm_io_ioeventfd_add(section
, match_data
, data
, fd
);
804 static void kvm_eventfd_del(MemoryListener
*listener
,
805 MemoryRegionSection
*section
,
806 bool match_data
, uint64_t data
, int fd
)
808 if (section
->address_space
== get_system_memory()) {
809 kvm_mem_ioeventfd_del(section
, match_data
, data
, fd
);
811 kvm_io_ioeventfd_del(section
, match_data
, data
, fd
);
815 static MemoryListener kvm_memory_listener
= {
817 .commit
= kvm_commit
,
818 .region_add
= kvm_region_add
,
819 .region_del
= kvm_region_del
,
820 .region_nop
= kvm_region_nop
,
821 .log_start
= kvm_log_start
,
822 .log_stop
= kvm_log_stop
,
823 .log_sync
= kvm_log_sync
,
824 .log_global_start
= kvm_log_global_start
,
825 .log_global_stop
= kvm_log_global_stop
,
826 .eventfd_add
= kvm_eventfd_add
,
827 .eventfd_del
= kvm_eventfd_del
,
831 static void kvm_handle_interrupt(CPUState
*env
, int mask
)
833 env
->interrupt_request
|= mask
;
835 if (!qemu_cpu_is_self(env
)) {
840 int kvm_irqchip_set_irq(KVMState
*s
, int irq
, int level
)
842 struct kvm_irq_level event
;
845 assert(kvm_irqchip_in_kernel());
849 ret
= kvm_vm_ioctl(s
, s
->irqchip_inject_ioctl
, &event
);
851 perror("kvm_set_irqchip_line");
855 return (s
->irqchip_inject_ioctl
== KVM_IRQ_LINE
) ? 1 : event
.status
;
858 #ifdef KVM_CAP_IRQ_ROUTING
859 static void set_gsi(KVMState
*s
, unsigned int gsi
)
861 assert(gsi
< s
->max_gsi
);
863 s
->used_gsi_bitmap
[gsi
/ 32] |= 1U << (gsi
% 32);
866 static void kvm_init_irq_routing(KVMState
*s
)
870 gsi_count
= kvm_check_extension(s
, KVM_CAP_IRQ_ROUTING
);
872 unsigned int gsi_bits
, i
;
874 /* Round up so we can search ints using ffs */
875 gsi_bits
= (gsi_count
+ 31) / 32;
876 s
->used_gsi_bitmap
= g_malloc0(gsi_bits
/ 8);
877 s
->max_gsi
= gsi_bits
;
879 /* Mark any over-allocated bits as already in use */
880 for (i
= gsi_count
; i
< gsi_bits
; i
++) {
885 s
->irq_routes
= g_malloc0(sizeof(*s
->irq_routes
));
886 s
->nr_allocated_irq_routes
= 0;
888 kvm_arch_init_irq_routing(s
);
891 static void kvm_add_routing_entry(KVMState
*s
,
892 struct kvm_irq_routing_entry
*entry
)
894 struct kvm_irq_routing_entry
*new;
897 if (s
->irq_routes
->nr
== s
->nr_allocated_irq_routes
) {
898 n
= s
->nr_allocated_irq_routes
* 2;
902 size
= sizeof(struct kvm_irq_routing
);
903 size
+= n
* sizeof(*new);
904 s
->irq_routes
= g_realloc(s
->irq_routes
, size
);
905 s
->nr_allocated_irq_routes
= n
;
907 n
= s
->irq_routes
->nr
++;
908 new = &s
->irq_routes
->entries
[n
];
909 memset(new, 0, sizeof(*new));
910 new->gsi
= entry
->gsi
;
911 new->type
= entry
->type
;
912 new->flags
= entry
->flags
;
915 set_gsi(s
, entry
->gsi
);
918 void kvm_irqchip_add_route(KVMState
*s
, int irq
, int irqchip
, int pin
)
920 struct kvm_irq_routing_entry e
;
923 e
.type
= KVM_IRQ_ROUTING_IRQCHIP
;
925 e
.u
.irqchip
.irqchip
= irqchip
;
926 e
.u
.irqchip
.pin
= pin
;
927 kvm_add_routing_entry(s
, &e
);
930 int kvm_irqchip_commit_routes(KVMState
*s
)
932 s
->irq_routes
->flags
= 0;
933 return kvm_vm_ioctl(s
, KVM_SET_GSI_ROUTING
, s
->irq_routes
);
936 #else /* !KVM_CAP_IRQ_ROUTING */
938 static void kvm_init_irq_routing(KVMState
*s
)
941 #endif /* !KVM_CAP_IRQ_ROUTING */
943 static int kvm_irqchip_create(KVMState
*s
)
945 QemuOptsList
*list
= qemu_find_opts("machine");
948 if (QTAILQ_EMPTY(&list
->head
) ||
949 !qemu_opt_get_bool(QTAILQ_FIRST(&list
->head
),
950 "kernel_irqchip", false) ||
951 !kvm_check_extension(s
, KVM_CAP_IRQCHIP
)) {
955 ret
= kvm_vm_ioctl(s
, KVM_CREATE_IRQCHIP
);
957 fprintf(stderr
, "Create kernel irqchip failed\n");
961 s
->irqchip_inject_ioctl
= KVM_IRQ_LINE
;
962 if (kvm_check_extension(s
, KVM_CAP_IRQ_INJECT_STATUS
)) {
963 s
->irqchip_inject_ioctl
= KVM_IRQ_LINE_STATUS
;
965 kvm_kernel_irqchip
= true;
967 kvm_init_irq_routing(s
);
974 static const char upgrade_note
[] =
975 "Please upgrade to at least kernel 2.6.29 or recent kvm-kmod\n"
976 "(see http://sourceforge.net/projects/kvm).\n";
978 const KVMCapabilityInfo
*missing_cap
;
982 s
= g_malloc0(sizeof(KVMState
));
984 #ifdef KVM_CAP_SET_GUEST_DEBUG
985 QTAILQ_INIT(&s
->kvm_sw_breakpoints
);
987 for (i
= 0; i
< ARRAY_SIZE(s
->slots
); i
++) {
988 s
->slots
[i
].slot
= i
;
991 s
->fd
= qemu_open("/dev/kvm", O_RDWR
);
993 fprintf(stderr
, "Could not access KVM kernel module: %m\n");
998 ret
= kvm_ioctl(s
, KVM_GET_API_VERSION
, 0);
999 if (ret
< KVM_API_VERSION
) {
1003 fprintf(stderr
, "kvm version too old\n");
1007 if (ret
> KVM_API_VERSION
) {
1009 fprintf(stderr
, "kvm version not supported\n");
1013 s
->vmfd
= kvm_ioctl(s
, KVM_CREATE_VM
, 0);
1016 fprintf(stderr
, "Please add the 'switch_amode' kernel parameter to "
1017 "your host kernel command line\n");
1023 missing_cap
= kvm_check_extension_list(s
, kvm_required_capabilites
);
1026 kvm_check_extension_list(s
, kvm_arch_required_capabilities
);
1030 fprintf(stderr
, "kvm does not support %s\n%s",
1031 missing_cap
->name
, upgrade_note
);
1035 s
->coalesced_mmio
= kvm_check_extension(s
, KVM_CAP_COALESCED_MMIO
);
1037 s
->broken_set_mem_region
= 1;
1038 ret
= kvm_check_extension(s
, KVM_CAP_JOIN_MEMORY_REGIONS_WORKS
);
1040 s
->broken_set_mem_region
= 0;
1043 #ifdef KVM_CAP_VCPU_EVENTS
1044 s
->vcpu_events
= kvm_check_extension(s
, KVM_CAP_VCPU_EVENTS
);
1047 s
->robust_singlestep
=
1048 kvm_check_extension(s
, KVM_CAP_X86_ROBUST_SINGLESTEP
);
1050 #ifdef KVM_CAP_DEBUGREGS
1051 s
->debugregs
= kvm_check_extension(s
, KVM_CAP_DEBUGREGS
);
1054 #ifdef KVM_CAP_XSAVE
1055 s
->xsave
= kvm_check_extension(s
, KVM_CAP_XSAVE
);
1059 s
->xcrs
= kvm_check_extension(s
, KVM_CAP_XCRS
);
1062 #ifdef KVM_CAP_PIT_STATE2
1063 s
->pit_state2
= kvm_check_extension(s
, KVM_CAP_PIT_STATE2
);
1066 ret
= kvm_arch_init(s
);
1071 ret
= kvm_irqchip_create(s
);
1077 memory_listener_register(&kvm_memory_listener
, NULL
);
1079 s
->many_ioeventfds
= kvm_check_many_ioeventfds();
1081 cpu_interrupt_handler
= kvm_handle_interrupt
;
1099 static void kvm_handle_io(uint16_t port
, void *data
, int direction
, int size
,
1103 uint8_t *ptr
= data
;
1105 for (i
= 0; i
< count
; i
++) {
1106 if (direction
== KVM_EXIT_IO_IN
) {
1109 stb_p(ptr
, cpu_inb(port
));
1112 stw_p(ptr
, cpu_inw(port
));
1115 stl_p(ptr
, cpu_inl(port
));
1121 cpu_outb(port
, ldub_p(ptr
));
1124 cpu_outw(port
, lduw_p(ptr
));
1127 cpu_outl(port
, ldl_p(ptr
));
1136 static int kvm_handle_internal_error(CPUState
*env
, struct kvm_run
*run
)
1138 fprintf(stderr
, "KVM internal error.");
1139 if (kvm_check_extension(kvm_state
, KVM_CAP_INTERNAL_ERROR_DATA
)) {
1142 fprintf(stderr
, " Suberror: %d\n", run
->internal
.suberror
);
1143 for (i
= 0; i
< run
->internal
.ndata
; ++i
) {
1144 fprintf(stderr
, "extra data[%d]: %"PRIx64
"\n",
1145 i
, (uint64_t)run
->internal
.data
[i
]);
1148 fprintf(stderr
, "\n");
1150 if (run
->internal
.suberror
== KVM_INTERNAL_ERROR_EMULATION
) {
1151 fprintf(stderr
, "emulation failure\n");
1152 if (!kvm_arch_stop_on_emulation_error(env
)) {
1153 cpu_dump_state(env
, stderr
, fprintf
, CPU_DUMP_CODE
);
1154 return EXCP_INTERRUPT
;
1157 /* FIXME: Should trigger a qmp message to let management know
1158 * something went wrong.
1163 void kvm_flush_coalesced_mmio_buffer(void)
1165 KVMState
*s
= kvm_state
;
1167 if (s
->coalesced_flush_in_progress
) {
1171 s
->coalesced_flush_in_progress
= true;
1173 if (s
->coalesced_mmio_ring
) {
1174 struct kvm_coalesced_mmio_ring
*ring
= s
->coalesced_mmio_ring
;
1175 while (ring
->first
!= ring
->last
) {
1176 struct kvm_coalesced_mmio
*ent
;
1178 ent
= &ring
->coalesced_mmio
[ring
->first
];
1180 cpu_physical_memory_write(ent
->phys_addr
, ent
->data
, ent
->len
);
1182 ring
->first
= (ring
->first
+ 1) % KVM_COALESCED_MMIO_MAX
;
1186 s
->coalesced_flush_in_progress
= false;
1189 static void do_kvm_cpu_synchronize_state(void *_env
)
1191 CPUState
*env
= _env
;
1193 if (!env
->kvm_vcpu_dirty
) {
1194 kvm_arch_get_registers(env
);
1195 env
->kvm_vcpu_dirty
= 1;
1199 void kvm_cpu_synchronize_state(CPUState
*env
)
1201 if (!env
->kvm_vcpu_dirty
) {
1202 run_on_cpu(env
, do_kvm_cpu_synchronize_state
, env
);
1206 void kvm_cpu_synchronize_post_reset(CPUState
*env
)
1208 kvm_arch_put_registers(env
, KVM_PUT_RESET_STATE
);
1209 env
->kvm_vcpu_dirty
= 0;
1212 void kvm_cpu_synchronize_post_init(CPUState
*env
)
1214 kvm_arch_put_registers(env
, KVM_PUT_FULL_STATE
);
1215 env
->kvm_vcpu_dirty
= 0;
1218 int kvm_cpu_exec(CPUState
*env
)
1220 struct kvm_run
*run
= env
->kvm_run
;
1223 DPRINTF("kvm_cpu_exec()\n");
1225 if (kvm_arch_process_async_events(env
)) {
1226 env
->exit_request
= 0;
1231 if (env
->kvm_vcpu_dirty
) {
1232 kvm_arch_put_registers(env
, KVM_PUT_RUNTIME_STATE
);
1233 env
->kvm_vcpu_dirty
= 0;
1236 kvm_arch_pre_run(env
, run
);
1237 if (env
->exit_request
) {
1238 DPRINTF("interrupt exit requested\n");
1240 * KVM requires us to reenter the kernel after IO exits to complete
1241 * instruction emulation. This self-signal will ensure that we
1244 qemu_cpu_kick_self();
1246 qemu_mutex_unlock_iothread();
1248 run_ret
= kvm_vcpu_ioctl(env
, KVM_RUN
, 0);
1250 qemu_mutex_lock_iothread();
1251 kvm_arch_post_run(env
, run
);
1253 kvm_flush_coalesced_mmio_buffer();
1256 if (run_ret
== -EINTR
|| run_ret
== -EAGAIN
) {
1257 DPRINTF("io window exit\n");
1258 ret
= EXCP_INTERRUPT
;
1261 fprintf(stderr
, "error: kvm run failed %s\n",
1262 strerror(-run_ret
));
1266 switch (run
->exit_reason
) {
1268 DPRINTF("handle_io\n");
1269 kvm_handle_io(run
->io
.port
,
1270 (uint8_t *)run
+ run
->io
.data_offset
,
1277 DPRINTF("handle_mmio\n");
1278 cpu_physical_memory_rw(run
->mmio
.phys_addr
,
1281 run
->mmio
.is_write
);
1284 case KVM_EXIT_IRQ_WINDOW_OPEN
:
1285 DPRINTF("irq_window_open\n");
1286 ret
= EXCP_INTERRUPT
;
1288 case KVM_EXIT_SHUTDOWN
:
1289 DPRINTF("shutdown\n");
1290 qemu_system_reset_request();
1291 ret
= EXCP_INTERRUPT
;
1293 case KVM_EXIT_UNKNOWN
:
1294 fprintf(stderr
, "KVM: unknown exit, hardware reason %" PRIx64
"\n",
1295 (uint64_t)run
->hw
.hardware_exit_reason
);
1298 case KVM_EXIT_INTERNAL_ERROR
:
1299 ret
= kvm_handle_internal_error(env
, run
);
1302 DPRINTF("kvm_arch_handle_exit\n");
1303 ret
= kvm_arch_handle_exit(env
, run
);
1309 cpu_dump_state(env
, stderr
, fprintf
, CPU_DUMP_CODE
);
1310 vm_stop(RUN_STATE_INTERNAL_ERROR
);
1313 env
->exit_request
= 0;
1317 int kvm_ioctl(KVMState
*s
, int type
, ...)
1324 arg
= va_arg(ap
, void *);
1327 ret
= ioctl(s
->fd
, type
, arg
);
1334 int kvm_vm_ioctl(KVMState
*s
, int type
, ...)
1341 arg
= va_arg(ap
, void *);
1344 ret
= ioctl(s
->vmfd
, type
, arg
);
1351 int kvm_vcpu_ioctl(CPUState
*env
, int type
, ...)
1358 arg
= va_arg(ap
, void *);
1361 ret
= ioctl(env
->kvm_fd
, type
, arg
);
1368 int kvm_has_sync_mmu(void)
1370 return kvm_check_extension(kvm_state
, KVM_CAP_SYNC_MMU
);
1373 int kvm_has_vcpu_events(void)
1375 return kvm_state
->vcpu_events
;
1378 int kvm_has_robust_singlestep(void)
1380 return kvm_state
->robust_singlestep
;
1383 int kvm_has_debugregs(void)
1385 return kvm_state
->debugregs
;
1388 int kvm_has_xsave(void)
1390 return kvm_state
->xsave
;
1393 int kvm_has_xcrs(void)
1395 return kvm_state
->xcrs
;
1398 int kvm_has_pit_state2(void)
1400 return kvm_state
->pit_state2
;
1403 int kvm_has_many_ioeventfds(void)
1405 if (!kvm_enabled()) {
1408 return kvm_state
->many_ioeventfds
;
1411 int kvm_has_gsi_routing(void)
1413 #ifdef KVM_CAP_IRQ_ROUTING
1414 return kvm_check_extension(kvm_state
, KVM_CAP_IRQ_ROUTING
);
1420 int kvm_allows_irq0_override(void)
1422 return !kvm_irqchip_in_kernel() || kvm_has_gsi_routing();
1425 void kvm_setup_guest_memory(void *start
, size_t size
)
1427 if (!kvm_has_sync_mmu()) {
1428 int ret
= qemu_madvise(start
, size
, QEMU_MADV_DONTFORK
);
1431 perror("qemu_madvise");
1433 "Need MADV_DONTFORK in absence of synchronous KVM MMU\n");
1439 #ifdef KVM_CAP_SET_GUEST_DEBUG
1440 struct kvm_sw_breakpoint
*kvm_find_sw_breakpoint(CPUState
*env
,
1443 struct kvm_sw_breakpoint
*bp
;
1445 QTAILQ_FOREACH(bp
, &env
->kvm_state
->kvm_sw_breakpoints
, entry
) {
1453 int kvm_sw_breakpoints_active(CPUState
*env
)
1455 return !QTAILQ_EMPTY(&env
->kvm_state
->kvm_sw_breakpoints
);
1458 struct kvm_set_guest_debug_data
{
1459 struct kvm_guest_debug dbg
;
1464 static void kvm_invoke_set_guest_debug(void *data
)
1466 struct kvm_set_guest_debug_data
*dbg_data
= data
;
1467 CPUState
*env
= dbg_data
->env
;
1469 dbg_data
->err
= kvm_vcpu_ioctl(env
, KVM_SET_GUEST_DEBUG
, &dbg_data
->dbg
);
1472 int kvm_update_guest_debug(CPUState
*env
, unsigned long reinject_trap
)
1474 struct kvm_set_guest_debug_data data
;
1476 data
.dbg
.control
= reinject_trap
;
1478 if (env
->singlestep_enabled
) {
1479 data
.dbg
.control
|= KVM_GUESTDBG_ENABLE
| KVM_GUESTDBG_SINGLESTEP
;
1481 kvm_arch_update_guest_debug(env
, &data
.dbg
);
1484 run_on_cpu(env
, kvm_invoke_set_guest_debug
, &data
);
1488 int kvm_insert_breakpoint(CPUState
*current_env
, target_ulong addr
,
1489 target_ulong len
, int type
)
1491 struct kvm_sw_breakpoint
*bp
;
1495 if (type
== GDB_BREAKPOINT_SW
) {
1496 bp
= kvm_find_sw_breakpoint(current_env
, addr
);
1502 bp
= g_malloc(sizeof(struct kvm_sw_breakpoint
));
1509 err
= kvm_arch_insert_sw_breakpoint(current_env
, bp
);
1515 QTAILQ_INSERT_HEAD(¤t_env
->kvm_state
->kvm_sw_breakpoints
,
1518 err
= kvm_arch_insert_hw_breakpoint(addr
, len
, type
);
1524 for (env
= first_cpu
; env
!= NULL
; env
= env
->next_cpu
) {
1525 err
= kvm_update_guest_debug(env
, 0);
1533 int kvm_remove_breakpoint(CPUState
*current_env
, target_ulong addr
,
1534 target_ulong len
, int type
)
1536 struct kvm_sw_breakpoint
*bp
;
1540 if (type
== GDB_BREAKPOINT_SW
) {
1541 bp
= kvm_find_sw_breakpoint(current_env
, addr
);
1546 if (bp
->use_count
> 1) {
1551 err
= kvm_arch_remove_sw_breakpoint(current_env
, bp
);
1556 QTAILQ_REMOVE(¤t_env
->kvm_state
->kvm_sw_breakpoints
, bp
, entry
);
1559 err
= kvm_arch_remove_hw_breakpoint(addr
, len
, type
);
1565 for (env
= first_cpu
; env
!= NULL
; env
= env
->next_cpu
) {
1566 err
= kvm_update_guest_debug(env
, 0);
1574 void kvm_remove_all_breakpoints(CPUState
*current_env
)
1576 struct kvm_sw_breakpoint
*bp
, *next
;
1577 KVMState
*s
= current_env
->kvm_state
;
1580 QTAILQ_FOREACH_SAFE(bp
, &s
->kvm_sw_breakpoints
, entry
, next
) {
1581 if (kvm_arch_remove_sw_breakpoint(current_env
, bp
) != 0) {
1582 /* Try harder to find a CPU that currently sees the breakpoint. */
1583 for (env
= first_cpu
; env
!= NULL
; env
= env
->next_cpu
) {
1584 if (kvm_arch_remove_sw_breakpoint(env
, bp
) == 0) {
1590 kvm_arch_remove_all_hw_breakpoints();
1592 for (env
= first_cpu
; env
!= NULL
; env
= env
->next_cpu
) {
1593 kvm_update_guest_debug(env
, 0);
1597 #else /* !KVM_CAP_SET_GUEST_DEBUG */
1599 int kvm_update_guest_debug(CPUState
*env
, unsigned long reinject_trap
)
1604 int kvm_insert_breakpoint(CPUState
*current_env
, target_ulong addr
,
1605 target_ulong len
, int type
)
1610 int kvm_remove_breakpoint(CPUState
*current_env
, target_ulong addr
,
1611 target_ulong len
, int type
)
1616 void kvm_remove_all_breakpoints(CPUState
*current_env
)
1619 #endif /* !KVM_CAP_SET_GUEST_DEBUG */
1621 int kvm_set_signal_mask(CPUState
*env
, const sigset_t
*sigset
)
1623 struct kvm_signal_mask
*sigmask
;
1627 return kvm_vcpu_ioctl(env
, KVM_SET_SIGNAL_MASK
, NULL
);
1630 sigmask
= g_malloc(sizeof(*sigmask
) + sizeof(*sigset
));
1633 memcpy(sigmask
->sigset
, sigset
, sizeof(*sigset
));
1634 r
= kvm_vcpu_ioctl(env
, KVM_SET_SIGNAL_MASK
, sigmask
);
1640 int kvm_set_ioeventfd_mmio_long(int fd
, uint32_t addr
, uint32_t val
, bool assign
)
1643 struct kvm_ioeventfd iofd
;
1645 iofd
.datamatch
= val
;
1648 iofd
.flags
= KVM_IOEVENTFD_FLAG_DATAMATCH
;
1651 if (!kvm_enabled()) {
1656 iofd
.flags
|= KVM_IOEVENTFD_FLAG_DEASSIGN
;
1659 ret
= kvm_vm_ioctl(kvm_state
, KVM_IOEVENTFD
, &iofd
);
1668 int kvm_set_ioeventfd_pio_word(int fd
, uint16_t addr
, uint16_t val
, bool assign
)
1670 struct kvm_ioeventfd kick
= {
1674 .flags
= KVM_IOEVENTFD_FLAG_DATAMATCH
| KVM_IOEVENTFD_FLAG_PIO
,
1678 if (!kvm_enabled()) {
1682 kick
.flags
|= KVM_IOEVENTFD_FLAG_DEASSIGN
;
1684 r
= kvm_vm_ioctl(kvm_state
, KVM_IOEVENTFD
, &kick
);
1691 int kvm_on_sigbus_vcpu(CPUState
*env
, int code
, void *addr
)
1693 return kvm_arch_on_sigbus_vcpu(env
, code
, addr
);
1696 int kvm_on_sigbus(int code
, void *addr
)
1698 return kvm_arch_on_sigbus(code
, addr
);